How To Backup "crontab -e" Files?

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http://serverfault.com – I want to do a complete server backup. I already have my backup script copying all of the html/php files for the web app, and the mysql databases, placing them into a .tar.gz file. How can I add the crontab files to that backup? Whenever I save the crontab, it goes to /tmp folder.. and when I check that folder immediately afterwards, it is empty. (HowTos)